In our second periodic report on science and tech trends, we looked at 3 emerging technologies with transformative potential: Neural implants for human augmentation could enable direct brain-to-brain communication, accelerated learning, or hands-free control of computers, but could also compromise user privacy and security. General purpose robots could alter daily life, with potentially significant social and environmental effects. Technologies to remove “space junk” could reduce the danger that more than 1 million pieces of debris pose to vital infrastructure in orbit, but legal ambiguities could stand in the way.